锂-硅粉末合金中锂、硅的重量配比要求较严,所以准确测定硅含量非常重要。过去,采用水解法分解试样,以重量法测定硅,这种方法反应异常剧烈,操作危险,且分析步骤繁琐。我们经试验拟定了水蒸气氧化分解试样,以差示分光光度法测定高含量硅。方法简便,溶样十分安全,适用于锂-硅粉末合金中含量高达50%硅的测定。实际试样分析获良好结果。 Lithium - silicon powder alloy lithium, silicon weight ratio requirements more stringent, so accurate determination of silicon content is very important. In the past, hydrolytic decomposition of the sample to gravimetric determination of silicon, this method unusually violent reaction, the operation dangerous, and the analysis steps cumbersome. We have developed a test sample of water vapor oxidation decomposition, differential spectrophotometric determination of high content of silicon. The method is simple and the sample is very safe. It is suitable for the determination of silicon up to 50% in lithium-silicon powder alloy. The actual sample analysis gave good results.